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Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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Deep geologic repository progress—2025 Update
Editor's note: This article has was originally published in November 2023. It has been updated with new information as of June 2025.
Outside my office, there is a display case filled with rock samples from all over the world. It contains a disk of translucent, orange salt from the Waste Isolation Pilot Plant near Carlsbad, N.M.; a core of white-and-bronze gneiss from the site of the future deep geologic repository in Eurajoki, Finland; several angular chunks of fine-grained, gray claystone from the underground research laboratory at Bure, France; and a piece of coarse-grained granite from the underground research tunnel in Daejeon, South Korea.
C. Christopher Klepper, Taner Uckan, Peter K. Mioduszewski, Robert T. McGrath, P. Hertout
Fusion Science and Technology | Volume 14 | Number 2 | September 1988 | Pages 288-298
Technical Paper | Plasma Engineering | doi.org/10.13182/FST88-A20262
Articles are hosted by Taylor and Francis Online.
Design of edge components for a plasma device requires a description of heat and particle flows at the edge of the device. In a tokamak, the ripple of the toroidal field affects the direction of such flows by affecting the direction of the field. In Tore Supra, in particular, the ripple is large (≤8% at the outboard edge). This causes a substantial (factor of ≤2) increase in heat flux deposited onto the limiter and antenna face. It also reduces the particle removal efficiency of the pump limiters by increasing the distance between the throat opening and the plasma edge. It is therefore important to include the ripple when designing plasma edge components such as pump limiters and radio-frequency antennas. A simple, but accurate, scheme for field line tracing is found and used to study this effect. Modeling of the ripple is discussed.